Downlink (DL) Transmission Timing of Integrated Access and Backhaul (IAB) Node

1. An apparatus comprising: one or more processors configured to cause a radio access node to: receive an uplink timing advance from a parent radio access node for a first communication between the radio access node and the parent radio access node; receive an additional timing offset value from the parent radio access node for a second communication between the radio access node and one or more of a child radio access node and a user equipment (UE); transmit a downlink transmission to the one or more of the child radio access node and the UE based on the uplink timing advance and the additional timing offset; and apply different analog spatial beamformers for receive signals transmitted by the parent radio access node and the child radio access node.

2. The apparatus according to claim 1, wherein the radio access node is integrated in a 5G communication network, and the downlink transmission is a signal of the 5G communication network.

3. The apparatus according to claim 1, wherein the apparatus comprises at least one receiver configured to receive signals transmitted by the parent radio access node and the child radio access node.

4. The apparatus according to claim 1, wherein the uplink timing advance is received from the parent radio access node via UE-specific signaling.

5. The apparatus according to claim 1, wherein the radio access node is a base station.

6. The apparatus according to claim 1, wherein the radio access node is an integrated access and backhaul node.

7. The apparatus according to claim 1, wherein the downlink transmission timing of the radio access node is aligned with the downlink transmission timing of the parent radio access node.

8. The apparatus according to claim 1, wherein the one or more processors is configured to cause the radio access node to: transmit a second downlink transmission to the user equipment based on the uplink timing advance and the additional timing offset.

9. A method comprising: receiving an uplink timing advance from a parent radio access node for a first communication between a radio access node and the parent radio access node; receiving an additional timing offset value from the parent radio access node for a second communication between the radio access node and one or more of a child radio access node and a user equipment (UE); transmitting a downlink transmission to the one or more of the child radio access node and the UE based on the uplink timing advance and the additional timing offset; and applying different analog spatial beamformers for receive signals transmitted by the parent radio access node and the child radio access node.

10. The method according to claim 9, wherein the radio access node is integrated in a 5G communication network, and the downlink transmission is a signal of the 5G communication network.

11. The method according to claim 9, wherein the uplink timing advance is received from the parent radio access node via UE-specific signaling.

12. The method according to claim 9, wherein the radio access node is a base station.

13. The method according to claim 9, wherein the radio access node is an integrated access and backhaul node.

14. The method according to claim 9, further comprising: transmitting a second downlink transmission to the user equipment based on the uplink timing advance and the additional timing offset.

15. A non-transitory memory medium storing program instructions, wherein the instructions, when executed by one or more processors, cause a radio access node to: receive an uplink timing advance from a parent radio access node for a first communication between the radio access node and the parent radio access node; receive an additional timing offset value from the parent radio access node for a second communication between the radio access node and one or more of a child radio access node and a user equipment (UE); transmit a downlink transmission to the one or more of the child radio access node and the UE based on the uplink timing advance and the additional timing offset; and applying different analog spatial beamformers for receive signals transmitted by the parent radio access node and the child radio access node.

16. The non-transitory memory medium of claim 15, wherein the uplink timing advance is received from the parent radio access node via UE-specific signaling.

17. The non-transitory memory medium of claim 15, transmitting a second downlink transmission to the user equipment based on the uplink timing advance and the additional timing offset.